CN103388519B - Select exhaust diagnostic control system and the method for the diagnosis of forbidding NOx reduction efficiency - Google Patents

Select exhaust diagnostic control system and the method for the diagnosis of forbidding NOx reduction efficiency Download PDF

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Publication number
CN103388519B
CN103388519B CN201310164477.9A CN201310164477A CN103388519B CN 103388519 B CN103388519 B CN 103388519B CN 201310164477 A CN201310164477 A CN 201310164477A CN 103388519 B CN103388519 B CN 103388519B
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treatment components
reducing agent
reliability
load
agent load
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CN103388519A (en
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J.E.科瓦尔科夫斯基
J.A.舍特尼
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GM Global Technology Operations LLC
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GM Global Technology Operations LLC
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1622—Catalyst reducing agent absorption capacity or consumption amount
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

The present invention relates to the exhaust diagnostic control system and method for selecting the diagnosis of forbidding NOx reduction efficiency.The component management module that a kind of exhaust diagnostic control system comprising test enabled module, performing for determining the reduction efficiency be associated with after-treatment components with the delivery temperature administration module of test enabled module communication and being configured to.Test enabled module is configured to the reliability of the estimation level of the reducing agent load evaluated in after-treatment components, and is optionally conducive to the forbidding of the follow-up test of the efficiency for determining the NOx reduction in after-treatment components based on this reliability.Delivery temperature administration module is configured to use the management of intrusive mood delivery temperature that the thermal creep stress of after-treatment components is adjusted to predetermined temperature range.For determining that the test of reduction efficiency comprises the NOx reduction efficiency determining after-treatment components.

Description

Select exhaust diagnostic control system and the method for the diagnosis of forbidding NOx reduction efficiency
Technical field
The present invention relates to vehicle exhaust system, and relate more specifically to the method for the performance being vented diagnosis and control system and evaluation and control after-treatment components and process.
Background technique
Describe for introducing background of the present invention generally in this background technique provided.The work of the inventor of current signature with regard to its degree described in this background parts and can not otherwise be considered to when it is described in submission prior art in, both impliedly do not thought ambiguously to destroy prior art of the present invention yet.
Between the main combustion period of diesel engine, air-fuel mixture is delivered to cylinder by suction valve and is compressed wherein and burn.After being combusted, piston forces the exhaust in cylinder to enter in vent systems.Exhaust can comprise nitrogen oxide (NOx) and carbon monoxide (CO).
Exhaust-gas treatment system can adopt catalyzer in one or more parts, and these parts are configured to realize such as nitrogen oxides reduction (NOx) to produce the last handling process of the more tolerable exhaust components of nitrogen (N2) and water (H2O).Reducing agent can add in exhaust in the upstream of the such as after-treatment components of selective catalytic reduction (SCR) parts, and be only citing, reducing agent can comprise anhydrous ammonia (NH3), ammoniacal liquor or urea, in them any one or all can spray in exhaust as mist.When the ammonia mixed with exhaust arrives after-treatment components, NOx emission thing is decomposed.Diesel particulate filter (DPF) then can trap cigarette ash, and this cigarette ash regularly can be incinerated during regenerative cycle.Effulent after water vapor, nitrogen and reduction leaves vent systems.
In order to the NOx reduction of remaining valid in after-treatment components, a kind of control, to keep the reducing agent (that is, reducing agent load) of aequum in after-treatment components can be adopted.Along with comprising the exhaust of NOx through after-treatment components, reducing agent is consumed, and load exhausts.Described control can utilize model to follow the tracks of and/or predicts the amount of the reducing agent loaded in after-treatment components and spray extra reducing agent as required, to maintain suitable reducing agent load for realizing effect needed for the NOx in such as reduction exhaust stream.
To have been noted that after safeguarding regeneration event to the prediction of the reducing agent load in the after-treatment components of such as SCR catalyst it may is inaccurate.The maintenance regeneration of DPF is usually carried out when delivery temperature is in higher level.Due to the temperature increased like this, be often necessary to maintain the flow by the reducing agent of (multiple) sparger, metering valve or other reprocessing hardware, to prevent cause thermal damage.
Although reducing agent load module can follow the tracks of the amount of sprayed reducing agent, this model may be difficult to determine in fact gathered how many reducing agents in SCR catalyst.With safeguard the high temperature that regeneration event is associated under, reducing agent may take system or may be oxidized out of with exhaust stream.Therefore, prediction may be difficult to and safeguard that regeneration period has how many reducing agents oxidized or be otherwise consumed in after-treatment components and how much may retain and gather to contribute to the loading of after-treatment components.
Therefore, the model of ammonia load estimates it may is inaccurate, and therefore becomes unreliable.Especially, experiment shows, after such as DPF safeguards that some event of regeneration event occurs, the observation level of the NH3 load that may significantly depart from after-treatment components is estimated in the load based on model.Therefore, may error result be produced based on the measurement of the NOx reduction efficiency in after-treatment components and the diagnostic procedure of evaluation, such as, in after-treatment components, wherein in fact load the more reducing agent supposed based on the inaccuracy of model than diagnostic system.Such situation may cause NH3 to escape, and this may cause some mutual sensitive sensor that the existence of NH3 is misinterpreted as NOx.Similarly, when actual NH3 load is significantly estimated lower than model, inaccurate NH3 load may cause diagnostic system evaluation than estimating worse NOx reduction efficiency, and this causes enabling of inaccurate diagnosis and the remedial measure that will take potentially.
Therefore, desirable to provide for optionally forbidding NOx reduction efficiency diagnosis to avoid the system and method for the improper startup of measure such when remedial measure non insurance during the time period when the degree of accuracy of reducing agent load estimation is be evaluated as unreliable.
Summary of the invention
In one exemplary embodiment of the present invention, exhaust diagnostic control system comprise test enabled module, with the delivery temperature administration module of test enabled module communication and a component management module, this component management module is configured to the test performed when test enabled module thinks that the reliability of estimation level of the reducing agent load in after-treatment components is in tolerance interval for determining the reduction efficiency be associated with after-treatment components.Test enabled module is configured to the process of the reliability of the estimation level performed for evaluating the reducing agent load in after-treatment components, and is optionally conducive to the forbidding of the follow-up test of the efficiency for determining the NOx reduction in after-treatment components based on this reliability.Delivery temperature administration module is configured to use the management of intrusive mood delivery temperature that the thermal creep stress of after-treatment components is adjusted to predetermined temperature range.For determining that the test of reduction efficiency comprises the NOx reduction efficiency determining after-treatment components.
In another exemplary embodiment of the present invention, a kind of for diagnosing the method for vent systems to comprise: the process performing the reliability of the estimation level for evaluating the reducing agent load in after-treatment components; And the forbidding of follow-up test of the efficiency for determining the NOx reduction in after-treatment components is optionally conducive to based on the reliability of the estimation level of the reducing agent load in after-treatment components.This process also comprises the management of use intrusive mood delivery temperature and the thermal creep stress of after-treatment components is adjusted to predetermined temperature range.When test enabled module thinks that the reliability of prediction level of the reducing agent load in after-treatment components is in tolerance interval, by determining the reduction efficiency that the NOx reduction efficiency and determining of after-treatment components is associated with after-treatment components.
The invention provides following technical proposal.
Technological scheme 1. 1 kinds of exhaust diagnostic control system, comprising:
Test enabled module, it is configured to the process of reliability of the estimation level performed for evaluating the reducing agent load in after-treatment components, and is optionally conducive to the forbidding of the follow-up test of the efficiency for determining the NOx reduction in described after-treatment components based on the described reliability of the estimation level of the reducing agent load in processing unit in the rear;
Delivery temperature administration module, itself and described test enabled module communication and be configured to use intrusive mood delivery temperature to manage the thermal creep stress of described after-treatment components is adjusted to predetermined temperature range; And
Component management module, it is configured to the test performed when described test enabled module thinks that the reliability of estimation level of the reducing agent load in after-treatment components is in tolerance interval for determining the reduction efficiency be associated with described after-treatment components, described for determining that the test of reduction efficiency comprises the NOx reduction efficiency determining described after-treatment components.
The exhaust diagnostic control system of technological scheme 2. according to technological scheme 1, the described reliability of the described estimation level of the reducing agent load wherein in after-treatment components is based on the operational condition of described after-treatment components.
The exhaust diagnostic control system of technological scheme 3. according to technological scheme 1, the described reliability of the described estimation level of the reducing agent load wherein in after-treatment components is based on the generation safeguarding regeneration event.
The exhaust diagnostic control system of technological scheme 4. according to technological scheme 1, the described reliability of the described estimation level of the reducing agent load wherein in after-treatment components is based on the high risk of the ammonia of the not controlled or unknown quantity loaded in described after-treatment components.
The exhaust diagnostic control system of technological scheme 5. according to technological scheme 1, the described reliability of the described estimation level of the reducing agent load wherein in after-treatment components is based on the deviation of the sensing between the NOx concentration and the NOx concentration of prediction of sensing.
The exhaust diagnostic control system of technological scheme 6. according to technological scheme 1, the process of the reliability of the wherein said estimation level for evaluating the reducing agent load in after-treatment components comprises the process of the reliability of the described estimation level performed for recovering the reducing agent load in processing unit in the rear.
The exhaust diagnostic control system of technological scheme 7. according to technological scheme 6, the process of the reliability of the wherein said described estimation level for recovering the reducing agent load in processing unit in the rear comprises the reducing agent load exhausted in described after-treatment components.
The exhaust diagnostic control system of technological scheme 8. according to technological scheme 7, the process of the reliability of the wherein said described estimation level for recovering the reducing agent load in processing unit in the rear comprises order and closes dosage until the load of reducing agent is exhausted into the level lower than predetermined threshold from described after-treatment components.
The exhaust diagnostic control system of technological scheme 9. according to technological scheme 1, wherein said test enabled module is configured to perform the process for evaluating the degree that NOx is reduced in described after-treatment components.
The exhaust diagnostic control system of technological scheme 10. according to technological scheme 9, wherein said test enabled module is configured to the information signal that performs for the NOx concentration of the information signal and described after-treatment components downstream that compare the NOx concentration reflecting described after-treatment components upstream and determines whether the difference between the NOx concentration of processing unit upstream in the rear and the NOx concentration in described after-treatment components downstream is less than or equal to the process of preset limit.
Technological scheme 11. 1 kinds, for diagnosing the method for vent systems, comprising:
Perform the process of reliability of the estimation level for evaluating the reducing agent load in after-treatment components, and be optionally conducive to the forbidding of the follow-up test of the efficiency for determining the NOx reduction in described after-treatment components based on the described reliability of the estimation level of the reducing agent load in processing unit in the rear;
Use the management of intrusive mood delivery temperature that the thermal creep stress of described after-treatment components is adjusted to predetermined temperature range; And
When described test enabled module thinks that the reliability of estimation level of the reducing agent load in after-treatment components is in tolerance interval, determine and the reduction efficiency that described after-treatment components is associated, describedly determine that reduction efficiency comprises the NOx reduction efficiency determining described after-treatment components.
The method for diagnose vent systems of technological scheme 12. according to technological scheme 11, the described reliability of the described estimation level of the reducing agent load wherein in after-treatment components is based on the operational condition of described after-treatment components.
The method for diagnose vent systems of technological scheme 13. according to technological scheme 11, the described reliability of the described estimation level of the reducing agent load wherein in after-treatment components is based on the generation safeguarding regeneration event.
The method for diagnose vent systems of technological scheme 14. according to technological scheme 11, the described reliability of the described estimation level of the reducing agent load wherein in after-treatment components is based on the high risk of the ammonia of the not controlled or unknown quantity be carried in described after-treatment components.
The method for diagnose vent systems of technological scheme 15. according to technological scheme 11, the described reliability of the described estimation level of the reducing agent load wherein in after-treatment components is based on the deviation of the sensing between the NOx concentration and the NOx concentration of prediction of sensing.
The method for diagnose vent systems of technological scheme 16. according to technological scheme 11, the reliability wherein evaluating the estimation level of the reducing agent load in after-treatment components comprises the process of the reliability of the described estimation level performed for recovering the reducing agent load in processing unit in the rear.
The method for diagnose vent systems of technological scheme 17. according to technological scheme 11, the reliability wherein recovering the described estimation level of the reducing agent load in processing unit in the rear comprises the reducing agent load exhausted in described after-treatment components.
The method for diagnose vent systems of technological scheme 18. according to technological scheme 11, also comprise the reliability of the described estimation level of the reducing agent load recovered in processing unit in the rear, it comprises order and closes dosage until the load of reducing agent is exhausted into the level lower than predetermined threshold from described after-treatment components.
The method for diagnose vent systems of technological scheme 19. according to technological scheme 11, also comprises and evaluates the degree that in described after-treatment components, NOx is reduced.
The method for diagnose vent systems of technological scheme 20. according to technological scheme 18, also comprises the information signal that compares the information signal of the NOx concentration reflecting described after-treatment components upstream and the NOx concentration in described after-treatment components downstream and determines whether the difference between the NOx concentration of processing unit upstream in the rear and the NOx concentration in described after-treatment components downstream is less than or equal to preset limit.
When read in conjunction with the accompanying drawings, according to following detailed description of the present invention, above-mentioned feature and advantage of the present invention and other feature and advantage will become more apparent.
Accompanying drawing explanation
Further feature, advantage and details only appear at by way of example embodiment following detailed description, with reference to accompanying drawing detailed description in, in the accompanying drawings:
Fig. 1 is that this exhaust diagnostic control system automatically resets when one or more trigger criteria occurs according to the functional block diagram comprising the engine control system of exhaust diagnostic control system of the present disclosure;
Fig. 2 is the functional block diagram of the exemplary enforcement of the control module of the exhaust diagnostic control system of Fig. 1;
Fig. 3 illustrates according to the method for resetting exhaust diagnostic control system when one or more trigger criteria occurs of the present disclosure; And
Fig. 4 illustrates the method for the temperature of the catalyzer for controlling after-treatment components.
Embodiment
Following description is in fact only exemplary and is certainly not intended to limit invention, its application, or uses.For the sake of clarity, the element will identical designated being used similar in the accompanying drawings.As used herein, at least one in phrase A, B and C should be construed as the logic (A or B or C) referring to use non-exclusive logical "or".Should be appreciated that when not changing principle of the present invention, can with the step in different order manner of execution.
As used herein, term " module " refers to specific integrated circuit (ASIC), electronic circuit, processor (shared, special or group) and performs the storage of one or more software or firmware program, combinational logic circuit and/or provide other suitable parts of described function.
Although following discloses content relates to diesel engine, other type of engine such as petrolic comprising direct fuel-injection engine can benefit from instruction herein.
According to one exemplary embodiment of the present invention, present disclose provides for optionally forbidding NOx reduction efficiency diagnosis during the time period when the degree of accuracy of reducing agent load estimation is be evaluated as unreliable to avoid the system and method for the improper startup of the measure such when remedial measure non insurance.For diagnosing and control the reliability that the example system of operation of after-treatment components and the load of method evaluation reducing agent are estimated in a high risk situation, and be conducive in due course suspending may inappropriate remedial measure when diagnostic control system and method will be predicted and depended on reducing agent load in these cases.Therefore, replace the diagnosis control measure carrying out estimating based on incredible load, system is activated to continue to operate without during notable change as NOx reduction efficiency.The normal running of diagnostic control system can restart, and estimates to be resumed to load once reliability the evaluation that just comprises after the renewal of NOx reduction efficiency.
After the reliability of expression load estimation is insincere and the actual reducing agent load therefore existed in after-treatment components can not mate the evaluation of enough significant risk of the load predicted by load module, suspend (namely forbidding) further evaluation to the NOx reduction efficiency that after-treatment components.The trigger criteria that the high risk estimated with insecure load is associated can comprise the judgement that load is greater than the threshold limit of such as calibrating the limit.
In certain embodiments, reliability can be returned to load by waiting until recalibration to be responsible for producing these models predicted always to estimate.Such recalibration is realized by the known reducing agent load be based upon in after-treatment components or on it.In certain embodiments, first this by exhausting the reducing agent of after-treatment components and realizing by reducing agent after-treatment components of reloading under the condition corresponding to high capacity the reliability of the adjustment model and degree of accuracy subsequently.The load module reliability increased and the condition of degree of accuracy are characterized by engine system operation in normal operation condition usually, make load module can be relevant to posterior infromation.Engine system is operated to exhaust reducing agent by maintaining relatively low level in reducing agent dosage or closing completely.When seldom or not have to perform regeneration event when dosage may be also effective for the reducing agent load reliably consumed in after-treatment components.When reliably supposing that reducing agent load is in the tolerance of known level (such as zero), therefore reducing agent load is re-established, and can think that model has been re-calibrated or has otherwise reset, make it be reliable to the prediction of reducing agent load.
By comparing the information signal that produced by upstream and downstream NOx sensor to confirm that any detectable difference between their output is all in acceptable level, can confirm fully exhausting of reducing agent.In addition or in alternative, the algorithm based on practical experience can be used to the degree determining to exhaust.Such as, for particular system, the speed that the operation of system may characterize reducing agent consumption fully can be understood for some operational condition.Therefore, this program is in known level for reducing agent load and provides guarantee.After NH3 load is depleted, normal dosage can be started to rebuild the known NH3 load (that is, reliably predicting by NH3 load module) on NOx catalyzer.
When model is by recalibration, normal controlling functions can be performed with the degree of accuracy improved and reliability.Therefore, evaluating reliability that load estimates and recover and after actual reducing agent load therefore in the after-treatment components possibility in the tolerance of the load predicted by load module, restart the evaluation to the NOx reduction efficiency in after-treatment components.If it is suitable that remedial measure is thought by diagnostic control system subsequently, then can to perform them to the confidence coefficient of the guaranteed raising of remedial measure.
Referring now to Fig. 1, schematically show diesel engine system 10.Diesel engine system 10 comprises diesel engine 12 and exhaust-gas treatment system 13.Exhaust-gas treatment system 13 comprises vent systems 14 and dosing system 16 further.Diesel engine 12 comprises cylinder 18, intake manifold 20, MAF (MAF) sensor 22 and engine speed sensor 24.Air flows into diesel engine 12 by intake manifold 20 and is monitored by maf sensor 22.Air is imported into cylinder 18 and with fuel combustion with driven plunger (not shown).Although illustrate single cylinder 18, be appreciated that diesel engine 12 can comprise extra cylinder 18.Such as, the diesel engine with 2,3,4,5,6,8,10,12 and 16 cylinders can be expected.
As the result of combustion process, produce exhaust in cylinder 18 inside.Vent systems 14 is released to the pretreatment exhaust of air in exhaust.Vent systems 14 comprises gas exhaust manifold 26 and diesel oxidation catalyst (DOC) 28.The exhaust leaving cylinder is directed through DOC28 by gas exhaust manifold 26.Exhaust is processed with emissions reduction in DOC28.Vent systems 14 also comprises after-treatment components 30, temperature transducer 31, inlet temperature sensor 32, outlet temperature sensor 34 and particulate filter (PF) 36.In one exemplary embodiment, after-treatment components 30 is selective catalytic reduction (SCR) parts.
Temperature transducer 31 can be positioned between motor and DOC18.Inlet temperature sensor 32 is positioned at after-treatment components 30 upstream with the temperature variation of monitoring in the ingress of after-treatment components 30.Outlet temperature sensor 34 is positioned at after-treatment components 30 downstream with the temperature variation of monitoring in the outlet port of after-treatment components 30.Although exhaust-gas treatment system 13 is depicted as the inlet temperature sensor 32 and outlet temperature sensor 34 that comprise and be arranged in after-treatment components 30 outside, inlet temperature sensor 32 and outlet temperature sensor 34 can be positioned at after-treatment components 30 inside with the temperature variation of the exhaust of monitoring at the entrance and exit place of after-treatment components 30.PF36 is further emissions reduction by the particle (i.e. cigarette ash) in trapping exhaust.
Dosing system 16 comprises dosage sparger 40, and reducing agent sprays into exhaust from reducing agent source 38 by it.Reducing agent and exhaust be mixed is incorporated in further emissions reduction when mixture is exposed to after-treatment components 30.Mixer 41 can be used in after-treatment components 30 combined upstream reducing agent and exhaust.Control module 42 regulates and controls the operation of engine system 10.
Extraction flow sensor 44 can generate the signal of the flow corresponding to the exhaust in vent systems.Although this sensor is shown between after-treatment components 30 and PF36, other positions various in vent systems also can be used to measure, comprise gas exhaust manifold downstream and after-treatment components 30 upstream.Temperature transducer 46 generates the particulate filter temperature corresponding to the particulate filter temperature measured.Temperature transducer 46 can be arranged on PF36 or inside.Temperature transducer 46 also can be positioned at upstream or the downstream of PF36.
Other sensor in vent systems can comprise upstream NOx sensor 50, this sensor based on the NOx existed in vent systems concentration and generate NOx signal.Downstream NOx sensor 52 can be positioned on PF36 downstream to measure the concentration leaving the NOx of PF36.In addition, ammonia (NH3) sensor 54 generates the signal of the amount of the ammonia corresponded in exhaust.NH3 sensor 54 is optional, but can be used to simplified control system due to the ability differentiated between NOx and NH3.Alternatively and/or in addition, hydrocarbon (HC) source 56 and HC sparger 58 can be provided to supply HC in the exhaust arriving DOC catalyzer.
Referring now to Fig. 2, control module 42 can comprise component management module 60, this module be used for monitor after-treatment components 30 performance (such as, the transformation efficiency of NOx) and/or be conducive to controlling the operation of after-treatment components 30.Control module 42 also comprises the delivery temperature administration module 62 of the temperature controlling after-treatment components 30 intrusively.
Component management module 60 comprises replacement module 70 and test starting module 72.As used herein, term " intrusive mood " represents that control module 42 change exceeds the control of the motor of operational condition to allow to test.Test starting module 72 starts the test of intrusive mood NOx reduction efficiency after trigger event (such as, the up-to-date fault of NOx reduction efficiency test before or the carrying out through scheduled time section or another milestone and/or other remedial measure) occurs in after-treatment components.
Intrusive mood test starting module 72 sends a signal to delivery temperature administration module 62 so that the intrusive mood temperature starting after-treatment components before the NOx reduction efficiency test in after-treatment components controls.Test enabled module 74 is guaranteed to meet conditions for use before startup test or controlling functions.
Delivery temperature administration module 62 comprises the after-treatment components temperature computation module 76 of the temperature calculating after-treatment components.Temperature computation module 76 can calculate the temperature of after-treatment components based on inlet temperature sensor 32, outlet temperature sensor 34, model or other suitable method any.Be only citing, temperature computation module 76 can calculate the temperature of after-treatment components based on the value from both inlet temperature sensor 32 and outlet temperature sensor 34.Be only citing, temperature computation module 76 can calculate this temperature based on the mean value of inlet temperature sensor 32 and outlet temperature sensor 34 or weighted mean value.
Control module 42, component management module 60 and/or delivery temperature administration module 62 can comprise parameter of operation adjustment 78, and it adjusted other operating parameter before the test of intrusive mood NOx reduction efficiency.Such as, such as other operating parameter of dosage, reducing agent load, EGR and/or other condition also can adjust before the test of intrusive mood NOx reduction efficiency in corresponding window.
Control module 42 comprises car speed limiting module 80, and this module limits car speed after NOx reduction efficiency drops on below predetermined threshold.Control module 42 also comprises fueling control module 82, these module determination fuel quantity, fuel injection timing, rear injection etc.When intrusive mood NOx reduction efficiency test pattern, delivery temperature administration module 62 adjusts fueling.Fueling adjustment adds the temperature of after-treatment components.Alternatively, fuel sprays into generate heat release in the exhaust of DOC catalyzer 28 upstream by hydrocarbon jet module 84, thus increases the temperature in after-treatment components.
Therefore, in one exemplary embodiment, exhaust diagnostic control system 68 comprises test enabled module 74, delivery temperature administration module 62 and exhaust diagnostic control system 68.Test enabled module 74 is configured to perform the process for the reliability and/or degree of accuracy evaluating reducing agent load estimation.In one exemplary embodiment, test enabled module 74 is configured in a high risk situation (such as, when there is the actual reducing agent load in after-treatment components and cannot mating the enough significant risk of the load predicted by load module) evaluates reliability in reducing agent load estimation and/or degree of accuracy.
Such as, the existence of high risk estimated of insecure load can based on the threshold limit of prediction load and the limit of such as calibrating compare and load is greater than the judgement of the limit.The detection that other index can comprise the excessively low or high NOx reduction efficiency be associated with after-treatment components 30, the deviation having safeguarded in the exhaust stream of the situation of regeneration event or the NOx concentration in the exhaust stream sensed and prediction between NOx concentration sensing in the not far past.
The evaluation of this type of risk also can based on motor or system operating condition.Such as, can draw between operational condition and the risk of inaccurate load estimation based on data or the coherence based on model.So relevant in order to be conducive to, can draw and rule of thumb characterize the condition that the high risk estimated with insecure load is associated.Such as; when engine system operate under abnormal or off-gauge operational condition make not exist calibrate load module accordingly reliable data (such as; posterior infromation, gross data) time time period after, risk can be characterized as being high unreasonably.
Delivery temperature administration module 62 is configured to use the management of intrusive mood delivery temperature that the thermal creep stress of after-treatment components 30 is adjusted to predetermined temperature range.Therefore, exemplary delivery temperature administration module 62 can be configured to reliability and/or the degree of accuracy of Restoration model load estimation.Such as, exemplary delivery temperature administration module 62 can perform the level for reducing agent load being reliably exhausted into lower than predetermined threshold and be based upon the process of the concentration known of the reducing agent in after-treatment components 30 subsequently.Process for exhausting reducing agent load can comprise execution regeneration event.Process for exhausting reducing agent load also can comprise order and stop dosage until be exhausted into the level lower than predetermined threshold from the load of the reducing agent of after-treatment components 30.
Component management module 60 is configured to do like this when being performed NOx reduction efficiency test by order.NOx reduction efficiency test comprises to be determined and the NOx reduction efficiency that after-treatment components 30 is associated.Component management module 60 also help test enabled module 74 think forbidding or suspend perform NOx reduction efficiency test suitable time whenever time-out or the test of forbidding NOx reduction efficiency.In one exemplary embodiment, test enabled module 74 performs the process being used for being conducive to when at any time producing some standard relevant with the evaluation of the risk of the rising that insecure load is estimated suspending NOx reduction efficiency and testing.Therefore, in conjunction with the evaluation of risk, test enabled module 74 quantizes risk and by it compared with threshold limit.When going beyond the limit of, test enabled module 74 or being signaled to suspend the execution of NOx reduction efficiency test during order to component management module 60, or avoid signaling to component management module 60 performing NOx reduction efficiency test.When not going beyond the limit of, test enabled module 74 or signal to continue or restart to perform NOx reduction efficiency test to component management module 60, or avoid signaling to component management module 60 suspending NOx reduction efficiency test.
Test starting module 72 is configured to perform the process for evaluating the degree that NOx is reduced in after-treatment components 30.Test starting module 72 is configured to perform for the process of the depleted degree of the reducing agent of evaluating after-treatment components 30 or for performing for comparing the reflection information signal of NOx concentration of after-treatment components 30 upstream and the information signal of the NOx concentration in after-treatment components 30 downstream and determining whether the difference between the NOx concentration of after-treatment components 30 upstream and the NOx concentration in after-treatment components 30 downstream is less than or equal to the process of preset limit.
Referring now to Fig. 3, control to start from 100 places, determine whether based on one or more the meeting situation of rated condition that at this place needs perform the test of intrusive mood NOx reduction efficiency or another ponent design test.Only citing, intrusive mood after-treatment components diagnostic test (its also can be used for infer reducing agent quality) can vehicle be placed in speed limit pattern and/or take after a failure other remedial measure with the NOx reduction efficiency test before passing through after perform.
If 100 is no, then controls to sentence normal mode 102 and carry out.If 100 is yes, then controls to continue at 104 places and determine whether the first set condition is acceptable with testing results.Be only citing, the first set condition can comprise the regeneration guaranteeing not perform PF36.Carry out when PF regeneration piles up cigarette ash usually in PF36.In addition, the first set condition can comprise guaranteeing not perform and adapts to amendment.When after-treatment components existing problems, make downstream NOx sensor measured value and based on model expectation NOx level between difference exceed predetermined tolerance-level time, carry out adaptations revise.In addition, this set condition comprises the evaluation of the load module forecasting reliability be associated with after-treatment components.Replace these conditioned disjunctions except these conditions, other condition can be used in the first set condition.
If 104 is no, then control to turn back to 100.If 104 is yes, then control continue at 106 places and forbid exhaust gas recirculatioon (EGR) alternatively.Alternatively, the process that can perform for recovering the reliability that load module is estimated is controlled.In one exemplary embodiment, reliability is by exhausting and re-establishing load to recover.Therefore, at 107 places, control to activate for exhausting reducing agent load to be based upon the process of the reliable restoration agent load in after-treatment components.Process for exhausting reducing agent load comprises order and carries out dosage with the level reduced (such as closing), until exhaust reducing agent load (that is, the reducing agent load in algorithm determination after-treatment components has been exhausted into the level being less than predetermined threshold) fully from after-treatment components.Alternatively, regeneration test can be started, to exhaust reducing agent load more quickly.By comparing the information signal that produced by upstream and downstream NOx sensor to confirm that any detectable difference between their output is all in acceptable level, can confirm fully exhausting of reducing agent.In addition, load module can be observed, to guarantee that it shows that after-treatment components is unloaded.In one exemplary embodiment, unloading can spend maximum 30 minutes.Exhaust in reducing agent load, and/or after exhausting predicted or confirmation, dosage can restart to set up known (that is, reliably can be predicted by reducing agent load model) load to reappear in after-treatment components.Afterwards, normal dosage can be restarted.
At 108 places, as long as evaluated degree of accuracy and/or the reliability of acceptable level with regard to load estimation, control just to activate the test of intrusive mood NOx reduction efficiency with the predetermined temperature range realizing after-treatment components.Control also to open dosage at 108 places.At 112 places, control to determine whether to exist enough reducing agent loads in after-treatment components (i.e. catalyzer) 30 and whether load estimation is reliable.Time delay can be utilized guarantee and reliably re-establish enough reducing agent loads, reliably to provide the measurable of NOx conversion and acceptable level.
If 112 is no, then control wait for, until exist to the reducing agent load in after-treatment components fully and estimate reliably.At 114 places, control to determine whether to meet second group of conditions for use.Be only citing, it is one or more that second group of conditions for use can comprise in following condition: extraction flow is in prespecified range; Upstream NOx mass flow rate is in prespecified range; Upstream NOx concentration in prespecified range and/or NOx sensor ready, and for the acceptable level of load module forecasting reliability.Other condition can be comprised in second group of conditions for use.
At 118 places, the efficiency of the NOx conversion/reduction process in control survey after-treatment components.At 120 places, control the efficiency of NOx reduction (that is, the transforming) process generated with the mass change of upstream and downstream accumulation.At 124 places, control to generate the efficiency threshold changed with upstream NOx, exhaust mass flow and after-treatment components temperature.Efficiency threshold can be expressed as percentage.
At 128 places, control to determine whether the efficiency of NOx conversion process is more than or equal to efficiency threshold.If 128 is yes, then control to announce sanctions status (this can be interpreted as signaling the acceptable reducing agent quality based on acceptable NOx reduction efficiency and/or after-treatment components operation) at 130 places.If 128 is no, then control to announce at 132 places unacceptable condition (this can be interpreted as unacceptable reducing agent quality based on unacceptable NOx reduction efficiency and/or the operation of unacceptable after-treatment components).When announcing unacceptable condition, can adopt remedial measures, such as, light beacon or cause the amendment of the mode of operation to after-treatment components and/or motor and/or vehicle.When announcing sanctions status, control any fault mode from 130 continue 134 and forbidding may cause intrusive mood to test.Such as, car speed unrestricted model and/or other remedial measure is terminated.Control to proceed to 140 from 132 and 134, wherein control to terminate intrusive mood delivery temperature and manage and enable EGR (if previously disabled).
Referring now to Fig. 4, show intrusive mood delivery temperature management method.At 146 places, control to determine whether the test of intrusive mood NOx reduction efficiency runs.If 146 is no, then control to turn back to 146.If 146 is yes, then controls to continue at 148 places, wherein control to determine after-treatment components temperature whether in predetermined temperature range (such as, between minimum temperature TLo and maximum temperature THi).
If 148 is yes, then control to turn back to 146.If 148 is no, then control to determine whether after-treatment components temperature is greater than minimum temperature TLo at 152 places.If 152 is no, then control to increase delivery temperature in any suitable manner.Such as, by changing fueling (fuel quantity, fuel injection timing, rear injection etc.), throughput (air inlet restriction, EGR valve and/or turbocharger vanes position) and/or increasing delivery temperature by starting at 154 places or increase HC injection.Control turns back to 146.
If 152 is yes, then control to determine whether after-treatment components temperature is less than maximum temperature THi at 156 places.If 156 is no, then control to reduce delivery temperature in any suitable manner.Such as, at 158 places by change fueling (fuel quantity, fuel injection timing, rear injection etc.), throughput (air inlet restriction, EGR valve and/or turbocharger vanes position) and/or by stop or reducing HC injection and increase delivery temperature.Control turns back to 146.If 156 is yes, then control to turn back to 146.
Therefore, the reliability (step 107) for diagnosing the method for vent systems to comprise the estimation level of the reducing agent load evaluated in after-treatment components.The method also comprises the evaluation based on the reliability of load estimation and is conducive to suspending and/or restarting NOx reduction efficiency.In addition, the method comprises and uses the management of intrusive mood delivery temperature that the thermal creep stress of after-treatment components is adjusted to predetermined temperature range (step 108) and execution and comprises and determine that the NOx reduction efficiency of the NOx reduction efficiency be associated with after-treatment components tests (step 118).Delivery temperature can such as be controlled by the fuel level in adjustment exhaust.Process (step 107) for evaluating the reliability of reducing agent load can comprise the process for such as recovering described computed reliability by performing regeneration event.Process for recovering reliability also can comprise order and stop dosage until be exhausted into the level lower than predetermined threshold from the load of the reducing agent of after-treatment components.
The method also can comprise to be evaluated the degree that is reduced in after-treatment components of NOx and/or evaluates the degree (step 118) that the reducing agent from after-treatment components exhausted.The method also can comprise and compares the reflection information signal of NOx concentration of after-treatment components upstream and the information signal of the NOx concentration in after-treatment components downstream and determine whether the difference between NOx concentration in after-treatment components upstream and the NOx concentration in after-treatment components downstream is less than or equal to preset limit.
By evaluating the forecasting reliability to the load of the NH3 of after-treatment components, and at any time load estimate reliability insincere time forbidding NOx reduction efficiency test, and further by providing the reliability and the ability restarting NOx efficiency test subsequently of recovering load module estimation, it is accurately that control reliably can guarantee that NH3 load is estimated, and can guarantee that reprocessing diagnostic test is carried out under the time being conducive to reliably knowing the NH3 load that post-processing catalyst exists and condition.Which increase efficiency of post treatment diagnosis robustness and avoid unnecessary remedial measure (such as, the mistake of beacon light or after executed DPF safeguards regeneration about the excessive DEF quality inducement of vehicle) unsuitable initiation.Therefore, may can realize, to the better control of discharging unit for discharging, engine system and vehicle, therefore can increasing customer satisfaction degree, can warranty costs be reduced and can confusion be reduced.
Although describe the present invention in conjunction with exemplary embodiment, it will be understood by those of skill in the art that without departing from the scope of the invention, can various change be carried out, and key element of the present invention can be substituted with equivalent.In addition, when not departing from essential scope of the present invention, many amendments can be carried out to adapt to specific situation or material based on instruction of the present invention.Therefore, be not intended to limit the invention to specific embodiment disclosed in this invention, on the contrary, the present invention will comprise all embodiments belonged within the scope of the application.

Claims (20)

1. an exhaust diagnostic control system, comprising:
Test enabled module, it is configured to the process of reliability of the estimation level performed for evaluating the reducing agent load in after-treatment components, and is optionally conducive to the forbidding of the follow-up test of the efficiency for determining the NOx reduction in described after-treatment components based on the described reliability of the estimation level of the reducing agent load in processing unit in the rear;
Delivery temperature administration module, itself and described test enabled module communication and be configured to use intrusive mood delivery temperature to manage the thermal creep stress of described after-treatment components is adjusted to predetermined temperature range; And
Component management module, it is configured to the test performed when described test enabled module thinks that the reliability of estimation level of the reducing agent load in after-treatment components is in tolerance interval for determining the reduction efficiency be associated with described after-treatment components, described for determining that the test of reduction efficiency comprises the NOx reduction efficiency determining described after-treatment components.
2. exhaust diagnostic control system according to claim 1, the described reliability of the described estimation level of the reducing agent load wherein in after-treatment components is based on the operational condition of described after-treatment components.
3. exhaust diagnostic control system according to claim 1, the described reliability of the described estimation level of the reducing agent load wherein in after-treatment components is based on the generation safeguarding regeneration event.
4. exhaust diagnostic control system according to claim 1, the described reliability of the described estimation level of the reducing agent load wherein in after-treatment components is based on the high risk of the ammonia of the not controlled or unknown quantity loaded in described after-treatment components.
5. exhaust diagnostic control system according to claim 1, the described reliability of the described estimation level of the reducing agent load wherein in after-treatment components is based on the deviation of the sensing between the NOx concentration and the NOx concentration of prediction of sensing.
6. exhaust diagnostic control system according to claim 1, the process of the reliability of the wherein said estimation level for evaluating the reducing agent load in after-treatment components comprises the process of the reliability of the described estimation level performed for recovering the reducing agent load in processing unit in the rear.
7. exhaust diagnostic control system according to claim 6, the process of the reliability of the wherein said described estimation level for recovering the reducing agent load in processing unit in the rear comprises the reducing agent load exhausted in described after-treatment components.
8. exhaust diagnostic control system according to claim 7, the process of the reliability of the wherein said described estimation level for recovering the reducing agent load in processing unit in the rear comprises order and closes dosage until the load of reducing agent is exhausted into the level lower than predetermined threshold from described after-treatment components.
9. exhaust diagnostic control system according to claim 1, wherein said test enabled module is configured to perform the process for evaluating the degree that NOx is reduced in described after-treatment components.
10. exhaust diagnostic control system according to claim 9, wherein said test enabled module is configured to the information signal that performs for the NOx concentration of the information signal and described after-treatment components downstream that compare the NOx concentration reflecting described after-treatment components upstream and determines whether the difference between the NOx concentration of processing unit upstream in the rear and the NOx concentration in described after-treatment components downstream is less than or equal to the process of preset limit.
11. 1 kinds, for diagnosing the method for vent systems, comprising:
Perform the process of reliability of the estimation level for evaluating the reducing agent load in after-treatment components, and be optionally conducive to the forbidding of the follow-up test of the efficiency for determining the NOx reduction in described after-treatment components based on the described reliability of the estimation level of the reducing agent load in processing unit in the rear;
Use the management of intrusive mood delivery temperature that the thermal creep stress of described after-treatment components is adjusted to predetermined temperature range; And
When described test enabled module thinks that the reliability of estimation level of the reducing agent load in after-treatment components is in tolerance interval, determine and the reduction efficiency that described after-treatment components is associated, describedly determine that reduction efficiency comprises the NOx reduction efficiency determining described after-treatment components.
12. is according to claim 11 for diagnosing the method for vent systems, and the described reliability of the described estimation level of the reducing agent load wherein in after-treatment components is based on the operational condition of described after-treatment components.
13. is according to claim 11 for diagnosing the method for vent systems, and the described reliability of the described estimation level of the reducing agent load wherein in after-treatment components is based on the generation safeguarding regeneration event.
14. is according to claim 11 for diagnosing the method for vent systems, and the described reliability of the described estimation level of the reducing agent load wherein in after-treatment components is based on the high risk of the ammonia of the not controlled or unknown quantity be carried in described after-treatment components.
15. is according to claim 11 for diagnosing the method for vent systems, and the described reliability of the described estimation level of the reducing agent load wherein in after-treatment components is based on the deviation of the sensing between the NOx concentration and the NOx concentration of prediction of sensing.
16. is according to claim 11 for diagnosing the method for vent systems, and the reliability wherein evaluating the estimation level of the reducing agent load in after-treatment components comprises the process of the reliability of the described estimation level performed for recovering the reducing agent load in processing unit in the rear.
17. is according to claim 11 for diagnosing the method for vent systems, and the reliability wherein recovering the described estimation level of the reducing agent load in processing unit in the rear comprises the reducing agent load exhausted in described after-treatment components.
18. is according to claim 11 for diagnosing the method for vent systems, also comprise the reliability of the described estimation level of the reducing agent load recovered in processing unit in the rear, it comprises order and closes dosage until the load of reducing agent is exhausted into the level lower than predetermined threshold from described after-treatment components.
19. is according to claim 11 for diagnosing the method for vent systems, also comprises and evaluate the degree that in described after-treatment components, NOx is reduced.
20. is according to claim 18 for diagnosing the method for vent systems, also comprises the information signal that compares the information signal of the NOx concentration reflecting described after-treatment components upstream and the NOx concentration in described after-treatment components downstream and determine whether the difference between the NOx concentration of processing unit upstream in the rear and the NOx concentration in described after-treatment components downstream is less than or equal to preset limit.
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